diff --git a/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpClientInstrumenterBuilder.java b/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpClientInstrumenterBuilder.java
index a7929ae56eba..980d78347379 100644
--- a/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpClientInstrumenterBuilder.java
+++ b/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpClientInstrumenterBuilder.java
@@ -50,9 +50,7 @@ public final class DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> {
 
   private final List<AttributesExtractor<? super REQUEST, ? super RESPONSE>> additionalExtractors =
       new ArrayList<>();
-  private Function<
-          SpanStatusExtractor<? super REQUEST, ? super RESPONSE>,
-          ? extends SpanStatusExtractor<? super REQUEST, ? super RESPONSE>>
+  private Function<SpanStatusExtractor<REQUEST, RESPONSE>, SpanStatusExtractor<REQUEST, RESPONSE>>
       statusExtractorTransformer = Function.identity();
   private final HttpClientAttributesExtractorBuilder<REQUEST, RESPONSE>
       httpAttributesExtractorBuilder;
@@ -60,7 +58,7 @@ public final class DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> {
   private final HttpSpanNameExtractorBuilder<REQUEST> httpSpanNameExtractorBuilder;
 
   @Nullable private final TextMapSetter<REQUEST> headerSetter;
-  private Function<SpanNameExtractor<? super REQUEST>, ? extends SpanNameExtractor<? super REQUEST>>
+  private Function<SpanNameExtractor<REQUEST>, ? extends SpanNameExtractor<REQUEST>>
       spanNameExtractorTransformer = Function.identity();
   private boolean emitExperimentalHttpClientMetrics = false;
   private Consumer<InstrumenterBuilder<REQUEST, RESPONSE>> builderCustomizer = b -> {};
@@ -111,9 +109,7 @@ public DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> addAttributesExtr
 
   @CanIgnoreReturnValue
   public DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> setStatusExtractor(
-      Function<
-              SpanStatusExtractor<? super REQUEST, ? super RESPONSE>,
-              ? extends SpanStatusExtractor<? super REQUEST, ? super RESPONSE>>
+      Function<SpanStatusExtractor<REQUEST, RESPONSE>, SpanStatusExtractor<REQUEST, RESPONSE>>
           statusExtractor) {
     this.statusExtractorTransformer = statusExtractor;
     return this;
@@ -180,7 +176,7 @@ public DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> setKnownMethods(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public DefaultHttpClientInstrumenterBuilder<REQUEST, RESPONSE> setSpanNameExtractor(
-      Function<SpanNameExtractor<? super REQUEST>, ? extends SpanNameExtractor<? super REQUEST>>
+      Function<SpanNameExtractor<REQUEST>, SpanNameExtractor<REQUEST>>
           spanNameExtractorTransformer) {
     this.spanNameExtractorTransformer = spanNameExtractorTransformer;
     return this;
diff --git a/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpServerInstrumenterBuilder.java b/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpServerInstrumenterBuilder.java
index 6b12403f779e..6c44b8b99b10 100644
--- a/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpServerInstrumenterBuilder.java
+++ b/instrumentation-api-incubator/src/main/java/io/opentelemetry/instrumentation/api/incubator/builder/internal/DefaultHttpServerInstrumenterBuilder.java
@@ -46,16 +46,14 @@ public final class DefaultHttpServerInstrumenterBuilder<REQUEST, RESPONSE> {
 
   private final List<AttributesExtractor<? super REQUEST, ? super RESPONSE>> additionalExtractors =
       new ArrayList<>();
-  private Function<
-          SpanStatusExtractor<? super REQUEST, ? super RESPONSE>,
-          ? extends SpanStatusExtractor<? super REQUEST, ? super RESPONSE>>
+  private Function<SpanStatusExtractor<REQUEST, RESPONSE>, SpanStatusExtractor<REQUEST, RESPONSE>>
       statusExtractorTransformer = Function.identity();
   private final HttpServerAttributesExtractorBuilder<REQUEST, RESPONSE>
       httpAttributesExtractorBuilder;
   private final HttpSpanNameExtractorBuilder<REQUEST> httpSpanNameExtractorBuilder;
 
   @Nullable private final TextMapGetter<REQUEST> headerGetter;
-  private Function<SpanNameExtractor<? super REQUEST>, ? extends SpanNameExtractor<? super REQUEST>>
+  private Function<SpanNameExtractor<REQUEST>, SpanNameExtractor<REQUEST>>
       spanNameExtractorTransformer = Function.identity();
   private final HttpServerRouteBuilder<REQUEST> httpServerRouteBuilder;
   private final HttpServerAttributesGetter<REQUEST, RESPONSE> attributesGetter;
@@ -109,9 +107,7 @@ public DefaultHttpServerInstrumenterBuilder<REQUEST, RESPONSE> addAttributesExtr
 
   @CanIgnoreReturnValue
   public DefaultHttpServerInstrumenterBuilder<REQUEST, RESPONSE> setStatusExtractor(
-      Function<
-              SpanStatusExtractor<? super REQUEST, ? super RESPONSE>,
-              ? extends SpanStatusExtractor<? super REQUEST, ? super RESPONSE>>
+      Function<SpanStatusExtractor<REQUEST, RESPONSE>, SpanStatusExtractor<REQUEST, RESPONSE>>
           statusExtractor) {
     this.statusExtractorTransformer = statusExtractor;
     return this;
@@ -179,7 +175,7 @@ public DefaultHttpServerInstrumenterBuilder<REQUEST, RESPONSE> setKnownMethods(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public DefaultHttpServerInstrumenterBuilder<REQUEST, RESPONSE> setSpanNameExtractor(
-      Function<SpanNameExtractor<? super REQUEST>, ? extends SpanNameExtractor<? super REQUEST>>
+      Function<SpanNameExtractor<REQUEST>, SpanNameExtractor<REQUEST>>
           spanNameExtractorTransformer) {
     this.spanNameExtractorTransformer = spanNameExtractorTransformer;
     return this;
diff --git a/instrumentation/apache-httpclient/apache-httpclient-4.3/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v4_3/ApacheHttpClientTelemetryBuilder.java b/instrumentation/apache-httpclient/apache-httpclient-4.3/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v4_3/ApacheHttpClientTelemetryBuilder.java
index f7b94dc65a7a..8b7f012f0dff 100644
--- a/instrumentation/apache-httpclient/apache-httpclient-4.3/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v4_3/ApacheHttpClientTelemetryBuilder.java
+++ b/instrumentation/apache-httpclient/apache-httpclient-4.3/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v4_3/ApacheHttpClientTelemetryBuilder.java
@@ -41,8 +41,7 @@ public final class ApacheHttpClientTelemetryBuilder {
    */
   @CanIgnoreReturnValue
   public ApacheHttpClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super ApacheHttpClientRequest, ? super HttpResponse>
-          attributesExtractor) {
+      AttributesExtractor<ApacheHttpClientRequest, HttpResponse> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -94,8 +93,8 @@ public ApacheHttpClientTelemetryBuilder setKnownMethods(Collection<String> known
   @CanIgnoreReturnValue
   public ApacheHttpClientTelemetryBuilder setSpanNameExtractor(
       Function<
-              SpanNameExtractor<? super ApacheHttpClientRequest>,
-              ? extends SpanNameExtractor<? super ApacheHttpClientRequest>>
+              SpanNameExtractor<ApacheHttpClientRequest>,
+              SpanNameExtractor<ApacheHttpClientRequest>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/apache-httpclient/apache-httpclient-5.2/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v5_2/ApacheHttpClientTelemetryBuilder.java b/instrumentation/apache-httpclient/apache-httpclient-5.2/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v5_2/ApacheHttpClientTelemetryBuilder.java
index d200d6e31492..800d38a0e1f5 100644
--- a/instrumentation/apache-httpclient/apache-httpclient-5.2/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v5_2/ApacheHttpClientTelemetryBuilder.java
+++ b/instrumentation/apache-httpclient/apache-httpclient-5.2/library/src/main/java/io/opentelemetry/instrumentation/apachehttpclient/v5_2/ApacheHttpClientTelemetryBuilder.java
@@ -41,8 +41,7 @@ public final class ApacheHttpClientTelemetryBuilder {
    */
   @CanIgnoreReturnValue
   public ApacheHttpClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super ApacheHttpClientRequest, ? super HttpResponse>
-          attributesExtractor) {
+      AttributesExtractor<ApacheHttpClientRequest, HttpResponse> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -94,8 +93,8 @@ public ApacheHttpClientTelemetryBuilder setKnownMethods(Collection<String> known
   @CanIgnoreReturnValue
   public ApacheHttpClientTelemetryBuilder setSpanNameExtractor(
       Function<
-              SpanNameExtractor<? super ApacheHttpClientRequest>,
-              ? extends SpanNameExtractor<? super ApacheHttpClientRequest>>
+              SpanNameExtractor<ApacheHttpClientRequest>,
+              SpanNameExtractor<ApacheHttpClientRequest>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaClientTelemetryBuilder.java b/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaClientTelemetryBuilder.java
index 8bdfecd45eef..2a0933d62b5a 100644
--- a/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaClientTelemetryBuilder.java
+++ b/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaClientTelemetryBuilder.java
@@ -40,8 +40,8 @@ public final class ArmeriaClientTelemetryBuilder {
   @CanIgnoreReturnValue
   public ArmeriaClientTelemetryBuilder setStatusExtractor(
       Function<
-              SpanStatusExtractor<? super ClientRequestContext, ? super RequestLog>,
-              ? extends SpanStatusExtractor<? super ClientRequestContext, ? super RequestLog>>
+              SpanStatusExtractor<ClientRequestContext, RequestLog>,
+              SpanStatusExtractor<ClientRequestContext, RequestLog>>
           statusExtractor) {
     builder.setStatusExtractor(statusExtractor);
     return this;
@@ -53,7 +53,7 @@ public ArmeriaClientTelemetryBuilder setStatusExtractor(
    */
   @CanIgnoreReturnValue
   public ArmeriaClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super ClientRequestContext, ? super RequestLog> attributesExtractor) {
+      AttributesExtractor<ClientRequestContext, RequestLog> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -104,9 +104,7 @@ public ArmeriaClientTelemetryBuilder setKnownMethods(Collection<String> knownMet
   /** Sets custom client {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public ArmeriaClientTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super ClientRequestContext>,
-              ? extends SpanNameExtractor<? super ClientRequestContext>>
+      Function<SpanNameExtractor<ClientRequestContext>, SpanNameExtractor<ClientRequestContext>>
           clientSpanNameExtractor) {
     builder.setSpanNameExtractor(clientSpanNameExtractor);
     return this;
diff --git a/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaServerTelemetryBuilder.java b/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaServerTelemetryBuilder.java
index ab05c3ddc17c..0e5d1e4a9f26 100644
--- a/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaServerTelemetryBuilder.java
+++ b/instrumentation/armeria/armeria-1.3/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_3/ArmeriaServerTelemetryBuilder.java
@@ -38,8 +38,8 @@ public final class ArmeriaServerTelemetryBuilder {
   @CanIgnoreReturnValue
   public ArmeriaServerTelemetryBuilder setStatusExtractor(
       Function<
-              SpanStatusExtractor<? super ServiceRequestContext, ? super RequestLog>,
-              ? extends SpanStatusExtractor<? super ServiceRequestContext, ? super RequestLog>>
+              SpanStatusExtractor<ServiceRequestContext, RequestLog>,
+              SpanStatusExtractor<ServiceRequestContext, RequestLog>>
           statusExtractor) {
     builder.setStatusExtractor(statusExtractor);
     return this;
@@ -51,7 +51,7 @@ public ArmeriaServerTelemetryBuilder setStatusExtractor(
    */
   @CanIgnoreReturnValue
   public ArmeriaServerTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super ServiceRequestContext, ? super RequestLog> attributesExtractor) {
+      AttributesExtractor<ServiceRequestContext, RequestLog> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -102,9 +102,7 @@ public ArmeriaServerTelemetryBuilder setKnownMethods(Collection<String> knownMet
   /** Sets custom server {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public ArmeriaServerTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super ServiceRequestContext>,
-              ? extends SpanNameExtractor<? super ServiceRequestContext>>
+      Function<SpanNameExtractor<ServiceRequestContext>, SpanNameExtractor<ServiceRequestContext>>
           serverSpanNameExtractor) {
     builder.setSpanNameExtractor(serverSpanNameExtractor);
     return this;
diff --git a/instrumentation/java-http-client/library/src/main/java/io/opentelemetry/instrumentation/httpclient/JavaHttpClientTelemetryBuilder.java b/instrumentation/java-http-client/library/src/main/java/io/opentelemetry/instrumentation/httpclient/JavaHttpClientTelemetryBuilder.java
index 2113ba276eb6..7f9d9a270c55 100644
--- a/instrumentation/java-http-client/library/src/main/java/io/opentelemetry/instrumentation/httpclient/JavaHttpClientTelemetryBuilder.java
+++ b/instrumentation/java-http-client/library/src/main/java/io/opentelemetry/instrumentation/httpclient/JavaHttpClientTelemetryBuilder.java
@@ -40,7 +40,7 @@ public final class JavaHttpClientTelemetryBuilder {
    */
   @CanIgnoreReturnValue
   public JavaHttpClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super HttpRequest, ? super HttpResponse<?>> attributesExtractor) {
+      AttributesExtractor<HttpRequest, HttpResponse<?>> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -91,9 +91,7 @@ public JavaHttpClientTelemetryBuilder setKnownMethods(Collection<String> knownMe
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public JavaHttpClientTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super HttpRequest>,
-              ? extends SpanNameExtractor<? super HttpRequest>>
+      Function<SpanNameExtractor<HttpRequest>, SpanNameExtractor<HttpRequest>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/jetty-httpclient/jetty-httpclient-12.0/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v12_0/JettyClientTelemetryBuilder.java b/instrumentation/jetty-httpclient/jetty-httpclient-12.0/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v12_0/JettyClientTelemetryBuilder.java
index f9025541c93f..d1e47cfb7049 100644
--- a/instrumentation/jetty-httpclient/jetty-httpclient-12.0/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v12_0/JettyClientTelemetryBuilder.java
+++ b/instrumentation/jetty-httpclient/jetty-httpclient-12.0/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v12_0/JettyClientTelemetryBuilder.java
@@ -55,7 +55,7 @@ public JettyClientTelemetryBuilder setSslContextFactory(
    */
   @CanIgnoreReturnValue
   public JettyClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super Request, ? super Response> attributesExtractor) {
+      AttributesExtractor<Request, Response> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -105,7 +105,7 @@ public JettyClientTelemetryBuilder setKnownMethods(Collection<String> knownMetho
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public JettyClientTelemetryBuilder setSpanNameExtractor(
-      Function<SpanNameExtractor<? super Request>, ? extends SpanNameExtractor<? super Request>>
+      Function<SpanNameExtractor<Request>, SpanNameExtractor<Request>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/jetty-httpclient/jetty-httpclient-9.2/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v9_2/JettyClientTelemetryBuilder.java b/instrumentation/jetty-httpclient/jetty-httpclient-9.2/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v9_2/JettyClientTelemetryBuilder.java
index 7489bb6e9667..74866dfb18c4 100644
--- a/instrumentation/jetty-httpclient/jetty-httpclient-9.2/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v9_2/JettyClientTelemetryBuilder.java
+++ b/instrumentation/jetty-httpclient/jetty-httpclient-9.2/library/src/main/java/io/opentelemetry/instrumentation/jetty/httpclient/v9_2/JettyClientTelemetryBuilder.java
@@ -55,7 +55,7 @@ public JettyClientTelemetryBuilder setSslContextFactory(SslContextFactory sslCon
    */
   @CanIgnoreReturnValue
   public JettyClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super Request, ? super Response> attributesExtractor) {
+      AttributesExtractor<Request, Response> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -105,7 +105,7 @@ public JettyClientTelemetryBuilder setKnownMethods(Collection<String> knownMetho
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public JettyClientTelemetryBuilder setSpanNameExtractor(
-      Function<SpanNameExtractor<? super Request>, ? extends SpanNameExtractor<? super Request>>
+      Function<SpanNameExtractor<Request>, SpanNameExtractor<Request>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/ktor/ktor-1.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v1_0/KtorServerTelemetry.kt b/instrumentation/ktor/ktor-1.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v1_0/KtorServerTelemetry.kt
index ccac1c8af92b..b9afcd1d4385 100644
--- a/instrumentation/ktor/ktor-1.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v1_0/KtorServerTelemetry.kt
+++ b/instrumentation/ktor/ktor-1.0/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v1_0/KtorServerTelemetry.kt
@@ -45,7 +45,7 @@ class KtorServerTelemetry private constructor(
     }
 
     fun setStatusExtractor(
-      extractor: (SpanStatusExtractor<in ApplicationRequest, in ApplicationResponse>) -> SpanStatusExtractor<in ApplicationRequest, in ApplicationResponse>
+      extractor: (SpanStatusExtractor<ApplicationRequest, ApplicationResponse>) -> SpanStatusExtractor<ApplicationRequest, ApplicationResponse>
     ) {
       builder.setStatusExtractor { prevExtractor ->
         SpanStatusExtractor {
@@ -63,7 +63,7 @@ class KtorServerTelemetry private constructor(
       this.spanKindExtractor = extractor
     }
 
-    fun addAttributesExtractor(extractor: AttributesExtractor<in ApplicationRequest, in ApplicationResponse>) {
+    fun addAttributesExtractor(extractor: AttributesExtractor<ApplicationRequest, ApplicationResponse>) {
       builder.addAttributesExtractor(extractor)
     }
 
diff --git a/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorClientTelemetryBuilder.kt b/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorClientTelemetryBuilder.kt
index 9a73fadd937b..2e603e758273 100644
--- a/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorClientTelemetryBuilder.kt
+++ b/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorClientTelemetryBuilder.kt
@@ -78,7 +78,7 @@ abstract class AbstractKtorClientTelemetryBuilder(
     })
   }
 
-  fun spanNameExtractor(spanNameExtractorTransformer: Function<SpanNameExtractor<in HttpRequestData>, out SpanNameExtractor<in HttpRequestData>>) {
+  fun spanNameExtractor(spanNameExtractorTransformer: Function<SpanNameExtractor<HttpRequestData>, SpanNameExtractor<HttpRequestData>>) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer)
   }
 
diff --git a/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorServerTelemetryBuilder.kt b/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorServerTelemetryBuilder.kt
index 781423dcfaf0..bf1c9292a679 100644
--- a/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorServerTelemetryBuilder.kt
+++ b/instrumentation/ktor/ktor-2-common/library/src/main/kotlin/io/opentelemetry/instrumentation/ktor/v2_0/common/AbstractKtorServerTelemetryBuilder.kt
@@ -42,7 +42,7 @@ abstract class AbstractKtorServerTelemetryBuilder(private val instrumentationNam
       )
   }
 
-  fun spanStatusExtractor(extract: SpanStatusData.(SpanStatusExtractor<in ApplicationRequest, in ApplicationResponse>) -> Unit) {
+  fun spanStatusExtractor(extract: SpanStatusData.(SpanStatusExtractor<ApplicationRequest, ApplicationResponse>) -> Unit) {
     builder.setStatusExtractor { prevExtractor ->
       SpanStatusExtractor {
           spanStatusBuilder: SpanStatusBuilder,
@@ -88,7 +88,7 @@ abstract class AbstractKtorServerTelemetryBuilder(private val instrumentationNam
     )
   }
 
-  fun spanNameExtractor(spanNameExtractorTransformer: Function<SpanNameExtractor<in ApplicationRequest>, out SpanNameExtractor<in ApplicationRequest>>) {
+  fun spanNameExtractor(spanNameExtractorTransformer: Function<SpanNameExtractor<ApplicationRequest>, SpanNameExtractor<ApplicationRequest>>) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer)
   }
 
diff --git a/instrumentation/netty/netty-4.1/library/src/main/java/io/opentelemetry/instrumentation/netty/v4_1/NettyClientTelemetryBuilder.java b/instrumentation/netty/netty-4.1/library/src/main/java/io/opentelemetry/instrumentation/netty/v4_1/NettyClientTelemetryBuilder.java
index 3f1669851214..f4ab564fdbe3 100644
--- a/instrumentation/netty/netty-4.1/library/src/main/java/io/opentelemetry/instrumentation/netty/v4_1/NettyClientTelemetryBuilder.java
+++ b/instrumentation/netty/netty-4.1/library/src/main/java/io/opentelemetry/instrumentation/netty/v4_1/NettyClientTelemetryBuilder.java
@@ -124,9 +124,7 @@ public NettyClientTelemetryBuilder setEmitExperimentalHttpClientMetrics(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public NettyClientTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super HttpRequestAndChannel>,
-              ? extends SpanNameExtractor<? super HttpRequestAndChannel>>
+      Function<SpanNameExtractor<HttpRequestAndChannel>, SpanNameExtractor<HttpRequestAndChannel>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/okhttp/okhttp-3.0/library/src/main/java/io/opentelemetry/instrumentation/okhttp/v3_0/OkHttpTelemetryBuilder.java b/instrumentation/okhttp/okhttp-3.0/library/src/main/java/io/opentelemetry/instrumentation/okhttp/v3_0/OkHttpTelemetryBuilder.java
index 671f87841e4e..fb4aa7ddd7e8 100644
--- a/instrumentation/okhttp/okhttp-3.0/library/src/main/java/io/opentelemetry/instrumentation/okhttp/v3_0/OkHttpTelemetryBuilder.java
+++ b/instrumentation/okhttp/okhttp-3.0/library/src/main/java/io/opentelemetry/instrumentation/okhttp/v3_0/OkHttpTelemetryBuilder.java
@@ -40,7 +40,7 @@ public final class OkHttpTelemetryBuilder {
    */
   @CanIgnoreReturnValue
   public OkHttpTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super Interceptor.Chain, ? super Response> attributesExtractor) {
+      AttributesExtractor<Interceptor.Chain, Response> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -89,9 +89,7 @@ public OkHttpTelemetryBuilder setKnownMethods(Collection<String> knownMethods) {
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public OkHttpTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super Interceptor.Chain>,
-              ? extends SpanNameExtractor<? super Interceptor.Chain>>
+      Function<SpanNameExtractor<Interceptor.Chain>, SpanNameExtractor<Interceptor.Chain>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackClientTelemetryBuilder.java b/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackClientTelemetryBuilder.java
index 968fb24cd270..bd7aba627735 100644
--- a/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackClientTelemetryBuilder.java
+++ b/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackClientTelemetryBuilder.java
@@ -36,7 +36,7 @@ public final class RatpackClientTelemetryBuilder {
 
   @CanIgnoreReturnValue
   public RatpackClientTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super RequestSpec, ? super HttpResponse> attributesExtractor) {
+      AttributesExtractor<RequestSpec, HttpResponse> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -87,9 +87,7 @@ public RatpackClientTelemetryBuilder setKnownMethods(Collection<String> knownMet
   /** Sets custom client {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public RatpackClientTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super RequestSpec>,
-              ? extends SpanNameExtractor<? super RequestSpec>>
+      Function<SpanNameExtractor<RequestSpec>, SpanNameExtractor<RequestSpec>>
           clientSpanNameExtractor) {
     builder.setSpanNameExtractor(clientSpanNameExtractor);
     return this;
diff --git a/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackServerTelemetryBuilder.java b/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackServerTelemetryBuilder.java
index d04c33741ece..10f78aa1a8e3 100644
--- a/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackServerTelemetryBuilder.java
+++ b/instrumentation/ratpack/ratpack-1.7/library/src/main/java/io/opentelemetry/instrumentation/ratpack/v1_7/RatpackServerTelemetryBuilder.java
@@ -40,7 +40,7 @@ public final class RatpackServerTelemetryBuilder {
    */
   @CanIgnoreReturnValue
   public RatpackServerTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super Request, ? super Response> attributesExtractor) {
+      AttributesExtractor<Request, Response> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -91,8 +91,7 @@ public RatpackServerTelemetryBuilder setKnownMethods(Collection<String> knownMet
   /** Sets custom server {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public RatpackServerTelemetryBuilder setSpanNameExtractor(
-      Function<SpanNameExtractor<? super Request>, ? extends SpanNameExtractor<? super Request>>
-          serverSpanNameExtractor) {
+      Function<SpanNameExtractor<Request>, SpanNameExtractor<Request>> serverSpanNameExtractor) {
     builder.setSpanNameExtractor(serverSpanNameExtractor);
     return this;
   }
diff --git a/instrumentation/restlet/restlet-1.1/library/src/main/java/io/opentelemetry/instrumentation/restlet/v1_1/RestletTelemetryBuilder.java b/instrumentation/restlet/restlet-1.1/library/src/main/java/io/opentelemetry/instrumentation/restlet/v1_1/RestletTelemetryBuilder.java
index b756c0069950..83bd2bb97b80 100644
--- a/instrumentation/restlet/restlet-1.1/library/src/main/java/io/opentelemetry/instrumentation/restlet/v1_1/RestletTelemetryBuilder.java
+++ b/instrumentation/restlet/restlet-1.1/library/src/main/java/io/opentelemetry/instrumentation/restlet/v1_1/RestletTelemetryBuilder.java
@@ -103,7 +103,7 @@ public RestletTelemetryBuilder setEmitExperimentalHttpServerMetrics(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public RestletTelemetryBuilder setSpanNameExtractor(
-      Function<SpanNameExtractor<? super Request>, ? extends SpanNameExtractor<? super Request>>
+      Function<SpanNameExtractor<Request>, SpanNameExtractor<Request>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/restlet/restlet-2.0/library/src/main/java/io/opentelemetry/instrumentation/restlet/v2_0/RestletTelemetryBuilder.java b/instrumentation/restlet/restlet-2.0/library/src/main/java/io/opentelemetry/instrumentation/restlet/v2_0/RestletTelemetryBuilder.java
index 84fa3d5752b0..751d8cf124dc 100644
--- a/instrumentation/restlet/restlet-2.0/library/src/main/java/io/opentelemetry/instrumentation/restlet/v2_0/RestletTelemetryBuilder.java
+++ b/instrumentation/restlet/restlet-2.0/library/src/main/java/io/opentelemetry/instrumentation/restlet/v2_0/RestletTelemetryBuilder.java
@@ -103,7 +103,7 @@ public RestletTelemetryBuilder setEmitExperimentalHttpServerMetrics(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public RestletTelemetryBuilder setSpanNameExtractor(
-      Function<SpanNameExtractor<? super Request>, ? extends SpanNameExtractor<? super Request>>
+      Function<SpanNameExtractor<Request>, SpanNameExtractor<Request>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/spring/spring-web/spring-web-3.1/library/src/main/java/io/opentelemetry/instrumentation/spring/web/v3_1/SpringWebTelemetryBuilder.java b/instrumentation/spring/spring-web/spring-web-3.1/library/src/main/java/io/opentelemetry/instrumentation/spring/web/v3_1/SpringWebTelemetryBuilder.java
index bba444061e51..329cb6b2e731 100644
--- a/instrumentation/spring/spring-web/spring-web-3.1/library/src/main/java/io/opentelemetry/instrumentation/spring/web/v3_1/SpringWebTelemetryBuilder.java
+++ b/instrumentation/spring/spring-web/spring-web-3.1/library/src/main/java/io/opentelemetry/instrumentation/spring/web/v3_1/SpringWebTelemetryBuilder.java
@@ -62,7 +62,7 @@ public SpringWebTelemetryBuilder addAttributeExtractor(
    */
   @CanIgnoreReturnValue
   public SpringWebTelemetryBuilder addAttributesExtractor(
-      AttributesExtractor<? super HttpRequest, ? super ClientHttpResponse> attributesExtractor) {
+      AttributesExtractor<HttpRequest, ClientHttpResponse> attributesExtractor) {
     builder.addAttributesExtractor(attributesExtractor);
     return this;
   }
@@ -92,9 +92,7 @@ public SpringWebTelemetryBuilder setCapturedResponseHeaders(Collection<String> r
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public SpringWebTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super HttpRequest>,
-              ? extends SpanNameExtractor<? super HttpRequest>>
+      Function<SpanNameExtractor<HttpRequest>, SpanNameExtractor<HttpRequest>>
           spanNameExtractorTransformer) {
     builder.setSpanNameExtractor(spanNameExtractorTransformer);
     return this;
diff --git a/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetryBuilder.java b/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetryBuilder.java
index feb2eaaab26c..e5c6a033c745 100644
--- a/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetryBuilder.java
+++ b/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxClientTelemetryBuilder.java
@@ -96,9 +96,7 @@ public SpringWebfluxClientTelemetryBuilder setKnownMethods(Collection<String> kn
   /** Sets custom client {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public SpringWebfluxClientTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super ClientRequest>,
-              ? extends SpanNameExtractor<? super ClientRequest>>
+      Function<SpanNameExtractor<ClientRequest>, SpanNameExtractor<ClientRequest>>
           clientSpanNameExtractor) {
     builder.setSpanNameExtractor(clientSpanNameExtractor);
     return this;
diff --git a/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxServerTelemetryBuilder.java b/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxServerTelemetryBuilder.java
index 5e51ef4474d5..bf6a5addb231 100644
--- a/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxServerTelemetryBuilder.java
+++ b/instrumentation/spring/spring-webflux/spring-webflux-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webflux/v5_3/SpringWebfluxServerTelemetryBuilder.java
@@ -97,9 +97,7 @@ public SpringWebfluxServerTelemetryBuilder setKnownMethods(Collection<String> kn
   /** Sets custom server {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public SpringWebfluxServerTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super ServerWebExchange>,
-              ? extends SpanNameExtractor<? super ServerWebExchange>>
+      Function<SpanNameExtractor<ServerWebExchange>, SpanNameExtractor<ServerWebExchange>>
           serverSpanNameExtractor) {
     builder.setSpanNameExtractor(serverSpanNameExtractor);
     return this;
diff --git a/instrumentation/spring/spring-webmvc/spring-webmvc-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v5_3/SpringWebMvcTelemetryBuilder.java b/instrumentation/spring/spring-webmvc/spring-webmvc-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v5_3/SpringWebMvcTelemetryBuilder.java
index 9da8a865b44c..f52ca4a73b80 100644
--- a/instrumentation/spring/spring-webmvc/spring-webmvc-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v5_3/SpringWebMvcTelemetryBuilder.java
+++ b/instrumentation/spring/spring-webmvc/spring-webmvc-5.3/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v5_3/SpringWebMvcTelemetryBuilder.java
@@ -78,9 +78,7 @@ public SpringWebMvcTelemetryBuilder setCapturedResponseHeaders(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public SpringWebMvcTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super HttpServletRequest>,
-              ? extends SpanNameExtractor<? super HttpServletRequest>>
+      Function<SpanNameExtractor<HttpServletRequest>, SpanNameExtractor<HttpServletRequest>>
           spanNameExtractor) {
     builder.setSpanNameExtractor(spanNameExtractor);
     return this;
diff --git a/instrumentation/spring/spring-webmvc/spring-webmvc-6.0/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v6_0/SpringWebMvcTelemetryBuilder.java b/instrumentation/spring/spring-webmvc/spring-webmvc-6.0/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v6_0/SpringWebMvcTelemetryBuilder.java
index d902058a6579..b363ff1131d2 100644
--- a/instrumentation/spring/spring-webmvc/spring-webmvc-6.0/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v6_0/SpringWebMvcTelemetryBuilder.java
+++ b/instrumentation/spring/spring-webmvc/spring-webmvc-6.0/library/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/v6_0/SpringWebMvcTelemetryBuilder.java
@@ -77,9 +77,7 @@ public SpringWebMvcTelemetryBuilder setCapturedResponseHeaders(
   /** Sets custom {@link SpanNameExtractor} via transform function. */
   @CanIgnoreReturnValue
   public SpringWebMvcTelemetryBuilder setSpanNameExtractor(
-      Function<
-              SpanNameExtractor<? super HttpServletRequest>,
-              ? extends SpanNameExtractor<? super HttpServletRequest>>
+      Function<SpanNameExtractor<HttpServletRequest>, SpanNameExtractor<HttpServletRequest>>
           spanNameExtractor) {
     builder.setSpanNameExtractor(spanNameExtractor);
     return this;